LayoutTests/fast/forms/range/input-range-sizing-fixed-size.html - WebKit - Git at Google

 <!DOCTYPE html>
 <style>
 input[type=range]::-webkit-slider-runnable-track {
     width: 800px;
 }
 </style>
 <input type="range">
	<!DOCTYPE html>
	<style>
	input[type=range]::-webkit-slider-runnable-track {
	width: 800px;
	}
	</style>
	<input type="range">